nightingale et a



Aug. .30, 1932. H. NIGHTINGALE ET AL 1,874,793

' DELAY ACTION VALVE Filed- Dec. 11. 1930 Patented Aug. 30, 1932 UNITED STATES PATENT OFFICE j HARRY NIGHTI'NGALR, OF UNTON KEAGH EHLOF TEANEGK, NEW

JERSEY, ASSIGNORS T0, TODD DRYDOCK, EKGINEERING & REPAIR CORPORATION, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK l J DELAY Ao'rIou VALVE Application filed December 11,1930. Serial lo. 501,498,

This invention relates to liquid control valves and our improvement is particularly directed to a delay action valve which is adapted to open automatically within a predetermined time lapse from the moment of first applying a pressure of liquid thereto.

Among other uses for our improved valve is that of controlling the flow of liquid fuel to furnaces in order to delay the flow to the "-2 3 burner until the speed of atomizer rotation and the pressure of air are adequate for efliciently atomizing thefuel.

It must be appreciated that one purpose in employing the delay action valve is in connection with the Todd type of liquid fuel burner with which is used a motor driven atomizer and a blower whose speed of rotation is high; also that the pump delivering the liquid fuel to the burner is'operated by power means included in the same electrical circuit that operatesthe atomizer and the blower.

Therefore when the controlling switch is actuated to close the circuit, thereby applying the electrical current, the liquid fuel valve is caused to'open and also the atomizer and blower are rotated. But since the motor shaft. which carries both the atomizer and the blower vanes requires a space of'time in which to speed up to the R. P. M. at which the fuel will be efliciently atomized, it is necessary to delay the flow, of liquid fuel to the atomizer.

Heretofore delay valves for controlling the supply of liquid fuel to furnaces have been caused to open under electrical actuating means, but without entirely satisfactory results. M

Therefore our present invention consists in the'provision of a pressure actuated, me-

chanical valve, set to open for-the passage of fuel within a predetermined lapse oftime following the closing of the circuit that-energizes the source of powe'rfor the atomizer, blower and pump.

This valve comprises a'casing having a'fluid passage-way therethrough and a stemto close said passage-way, said stem carrying a plunger which is adapted to be raised by the liquid pressure that is applied thereto through a by-pass, to thereby lift the stem and open the liquid fuel passage-way. V

The size of-the by-pass is suitablygauged,

and other by-passes are provided in the valve organism'to apply back pressurethereon,

whereby the elapsed time occupied in opening the liquid fuel passage-way is suflicient to enable the motor shaft to attain its maximum oreiiicientspeed. y

Other features and advantages of ourinvention will hereinafter appear.-

In the'drawingz" Figure l is a sectional elevation of our improved delay action valve, shown in its closed position. a l r Fig. 2 isa similar view, showing the valve open, and j Fig. 3 is a section on the line 38 of Fig. 1. In the views let 1 indicate a valve casing having the inlet port 2 and the outlet'port3. A supply pipe 4 is shown in communication with inlet port 2 and a delivery pipe 5 extends from outlet port 3.1 Y a The valve casing is shown as having a ver tically disposed, axial bore 6 in its lowerportion, and astem 7 of a plunger 8 is adapted to have reciprocal movement in said bore, to open and close the passageway through the valve, between the ports 2 and 3. It will be noted that the port 2 is covered by the stem 7 in the valve closed position, so that liquid cannot pass to port, being positioned below the stem,fremains uncovered. lifted, as shown in Fig. 2, then there is a free passage through the valve; Above the'bore 6 the interior area of the valve casing is ort 3, although the latter But when thestem' is enlarged and presentsahorizontal"surface closed position.

'to rise and thereby open the passage-way through the valve. p

The upper portion or extension 15 of stem 7 is of increased diameter andis provided with an aXia-lrecess 16, said'extension being slidable within a cylinder 17 whicli hasradial flange 18 that lies upon the peripheral edge of the casing wall, serving as closure means for the casing. An interiorly threaded. cap 19 engages a screw thread formed upon the casing to secure the closure means thereto.

There is aby-pass orifice 8a through the plunger 8,,leading from clearancell tothe space 20 within the casing, between the plunger 8 and flange18, and another by-pass orifice 21 through the wall of extension 15 leading into the space comprised by the recess 16 and the interior of cylinder 17. Also the top of cylinder 17 is provided with a cap in the form of a tubular section 22 having a base portion 23 which rests upon the top of cylinder 17, and is secured thereto as by a screw cap 24. Said base portion has. a discharge orifice 25 through which liquid may flow, and the section 22 is intended to connect with a return pipe (not shown) to re-convey liquid to the source of supply. The orifices 8a, 21 and 25 are all of smaller cross-section than orifice 14, and are intended to retard the rise of plunger 8 for the purpose of suitably delaying the action of stem 7 in opening the passage-way through the valve.

In practice we have found that orifice, 8a may with advantage be smaller than orifice 14; orifice 21 smaller than 8a, and orifice 25 smaller than 21. As a practical example-of orifice sizes, and without limiting our inven tion thereby, We refer to an. example now operating successfully wherein liquid fuel is supplied to thevalve at a pressure of ten pounds to the square inch and: the motor shaft is intended to drive the atomizer and blower at 3,500 B. P. M. In this instance, using, a quarter inch supply pipe, the diameter of orifice 14 is .070; orifice 8a is .06350; orifice 21 is -.0505, and orifice 25 is .035. Under the influence of direct pressure applied through orifice 14 to the plunger at clearance 11, andthe retardation afforded through the other orifices, we find the opening of the passage-way through the valve lifting action to be delayed for a period of about 15 seconds, and within that period of time the motor has become enabled to attain itsmaximum speed of 8,500 B. P. M. V

It will of course be understood that ifthe liquid fuel were to pass to thefurnace before the atomizer and blower were rotating at eiflcient speed, the result would be that the fuel would not become atomized but would .to normally close said passageway, means for conveying fluid, under pressure, from a source-of supply, to said passageway, by-

pass means. between said passageway and chamber adapted to convey fluid to the latter whereby fluid pressure may operate said plunger and stem to open said passageway, means for retarding the operation of said plunger, and means for returning all the bypassed fluid back, to the source of supply, through the chamber.

2.. The combination with a valve casing having. inlet and outlet ports, forming a passageway through the casing, of means for conveying fluid, under pressure, from a source ofsupply, to said inlet port, a plunger having a stem to normally close said inlet port, a cylindrical chamber containing said plunger, said casing having a by-pass communicating from saidinlet port to said chamber for the passageof fluid-to said chamber, there-by permittingpressure of fluid to lift said plunger. and stem for the delayed opening of the passageway, and means for returning all the by-passed fluid back to the sourceof supply, through the chamber.

8. The combination with a valve casing having inlet and outlet ports, forming a passageway through thecasing, of means for conveying fluid, under pressure, from a sourcev of supply, to said inlet port, a plung: er having a stem to normally close said inlet port, a cylindrical chamber containing said plunger, said casing having a bypass .communicating from said inlet port to said chamber forthe passage of fluid to said chamber, thereby permitting pressure of fluid tolift said plunger and stem for the delayed opening of the passageway, means for retarding the lift of said plunger, andmeans for returning all the by-passed fluid back to the source of supply, through the chamber.

, .4. In a delay action valve, the combination with a cylinder and a plunger therein, of a valve casing having a passageway therethrough, means for conveying fluid, under pressure, from a source of supply, to said passageway, avalve carried by said plunger to normally close said passageway, said cassaid passageway, and said plunger having a relief orifice extendin therethrough of less capacity than that in t e casing, to retard the lift of the plunger, and means for returning all the by-passed fluidback to the source of supply, through the chamber.

5. In a delay action valve, the combination with a cylinder and a plunger therein, of a valve casing having a passageway therethrough, means for conveying fluid, under pressure, from a source of supply, to said passageway, a valve carried by said plungerv to normally close said passageway, said casing having a by-pass orifice of capacity to admit to said cylinder within a predetermined period a quantity of the fluid, under pressure from said fluid conveying means to lift said plunger and valve, thereby opening said passageway, said plunger having a relief orifice passing therethrough of less capacity than that in the casing, to retard the lift of the plunger, and said plunger having a tubular extension whose wall is provided with a restricted orifice for the retarded issue of the fluid, and means for returning all the bypassed fluid back to the source of supply, through the chamber.

6. In a delay action valve, the combination with a cylinder and a plunger therein, of a valve casing having a passageway therethrough, means for conveying fluid, under pressure, from a source of supply, to said passageway, a valve carried by said plunger to normally close said passageway, said casing having a by-pass orifice of capacity to admit to said cylinder withinva predetermined period a quantity of the fluid, under pressure, from said fluid conveying means, to lift said plunger and valve, thereby opening said passageway, said plunger having a relief orifice passing therethrough' of less capacity than that in the casing, to retard the lift of the plunger, and said plunger having a tubular extension whose wall is provided with a restricted orifice for the issue of the fluid, a cylinder in which said extension rides to receive said fluid, and closure means for said cylinder having a more restricted orifice leading from said cylinder for further retardation, and means for returning all the by-passed fluid back to the a source of supply, through the chamber.

New York, N. Y., December 2, 1930,

HARRY NIGHTINGALE. HARRY MEACHEM. 

